Fix 64-bit truncation
Update/add cfi instructions for gas32/64 so they can support gcc_eh/libunwind exceptions
Stopping leaking comments, take two
Fix GCC emitter from putting the same label into the asm goto label list multiple times, which causes compile errors
Enable unwind tables on 64 bit targets
Further flag required for ld on linux
Add generation to gas64 too
This is exclusive apparently